Thermal resistance measurements of building envelope components of the minang traditional house using the heat flow method

摘要

Thermal properties of building envelope is a fundamental key to building energy design or in evaluating the energy performance of an existing building. In-situ measurements are often constrained by the low-temperature difference between the indoor and outdoor side of a building, thus requiring a longer measurement time and a higher cost. This paper attempts to overcome these obstacles by measuring building envelope in the conditioned chamber. The materials being measured are replicas of envelope components of the Minang traditional house. The thermal resistance was obtained by using the summation method (summation technique) according to the ASTM C1155. The specimens of the Minang traditional house wall were wooden plank (specimen no. 1) and wooden plank plus woven bamboo slats (specimen no. 2) while that of the roof was bamboo frame plus sugar palm fibers (specimen no. 3). The obtained average thermal resistances of wooden plank wall and wooden plank plus woven bamboo slats wall were 0.13 m2.K/W and 0.38 m2.K/W, respectively. The addition of woven bamboo slats increased the thermal resistance of the wooden plank wall. For the bamboo frame plus sugar palm fibers roof, its average thermal resistance was 1. 32 m2.K /W. This value gives the reason why the roof materials are in terms of receiving solar heat radiation.